JPH06234445A - Conveying method and conveying line for band-shaped object - Google Patents

Abstract

PURPOSE:To achieve stably conveying and high speed conveying a magnetic material band- shaped object by controlling conveying vertical directional displacement and conveying width directional displacement from magnetic field intensity in accordance with the vertical directional displacement from a conveying pass line and from an electrifying amount in accordance with the width directional displacement from the center of a band-shaped object supporter and the magnetic field intensity. CONSTITUTION:A displacement amount in a vertical direction of a magnetic material band- shaped object during conveyance is measured by a displacement meter 5 and fed to a compensating circuit 11 as a voltage signal. In the compensating circuit 11, the signal is compensation calculated and fed to an arithmetic circuit 13 as a voltage signal. Next in the arithmetic circuit 13, an electrifying quantity to an electromagnet 3a is obtained. A current value determined by calculation is conducted to the electromagnet 3a, and attracting force by a magnetic field is generated to suppress displacement of the band-shaped object. Next in a width direction, a displaced amount detected by displacement meters 4a, 4b is fed to a compensating circuit 12 as a voltage signal. In an arithmetic circuit 14, width direction generated electromagnetic force is calculated from a voltage signal of width directional displacement and calculated flux density, and electromagnetic force in an opposite direction to the displacement is generated to suppress the displacement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrying method and a carrying line in equipment for continuously treating magnetic strips such as thin metal plates.

[0002]

2. Description of the Related Art Generally, in a metal strip conveying line, for example, a steel strip conveying line in a heat treatment process, the steel strip comes into contact with a furnace wall and breaks due to a change in the widthwise position of the steel strip during conveyance, or a supporting roll. Rollout from the. In addition, the problem of non-uniform deposition of zinc or the like occurs in the surface treatment process such as plating due to the vertical position variation.

As a fluctuation control device in the conveying width direction for solving such a problem, as disclosed in Japanese Patent Laid-Open No. 3-297753, there is a direction orthogonal to the direction of the current passing through the steel strip and the current flowing through the steel strip. A non-contact type position control method has been proposed in which a magnetic field is applied to a steel strip to prevent the steel strip from being displaced by an electromagnetic force generated thereby.

Further, as a fluctuation control device in a direction perpendicular to the carrying direction, there is one disclosed in Japanese Patent Laid-Open No. 51-62107. The outline is shown in FIG. In this case, a jet stream 7 is blown onto the strip 1 from nozzles 6a and 6b arranged in the strip 1 in the longitudinal direction, and the strip 1 is conveyed while being deformed into a waveform by changing the strength of the front and back of the jet stream. By doing so, vertical fluctuations of the band-shaped material are suppressed.

[0005]

Thus, in the line for conveying the belt-like material as described above, in order to stably convey the belt-like material within the allowable range, a direction perpendicular to the conveying direction (perpendicular to the surface of the belt-like material is It is necessary to control the variation in the direction) and the width direction.

In the fluctuation control device disclosed in Japanese Patent Laid-Open No. 3-297753, since the position control in the direction perpendicular to the carrying direction is not performed, when the transported object is a magnetic strip such as a steel strip, There is a possibility that it will be attracted to the electromagnet and it will become impossible to carry it.

Further, in the fluctuation control device disclosed in Japanese Patent Laid-Open No. 51-62107, since a compressible fluid is sprayed on the band-shaped material, it is not possible to follow the vertical fluctuation of the band-shaped material at a high frequency, and the fluctuation is further increased. There is also a risk of

A first object of the present invention is to suppress the deviation of the magnetic metal strip in the direction perpendicular to the conveying direction and the deviation in the width direction thereof, and the vibration of the metal strip at a relatively high speed. A second object is to effectively suppress these deviations.

[0009]

[Means for Solving the Problems]

(1) In a method for transporting a magnetic metal strip, a step of calculating a magnetic field strength according to a vertical displacement amount from a transport path line, a widthwise displacement amount from a center of the strip supporting device, and the magnetic field A conveyance method comprising a step of calculating an energization amount according to strength and controlling a conveyance vertical direction displacement and a conveyance width direction displacement.

(2) In a device for transporting a metal strip having magnetism, the distances from the transport path line are different between the two current-carrying devices that apply magnetic field strength according to the amount of vertical displacement from the transport path line. And a displacement line in the direction perpendicular to the plane of conveyance and a displacement gauge in the direction of the width of the plane of conveyance are arranged between the electromagnets and the front and rear energizing devices.

(3) In the method of transporting two or more continuous magnetic material strips, the magnetic field strength is calculated from the vertical displacement from the transport path line and the coefficient correction corresponding to the magnetic permeability peculiar to the different materials. And a step of calculating a widthwise displacement amount from the center of the belt-shaped object supporting device and an energization amount according to the magnetic field strength, and the conveyance vertical direction displacement and the conveyance widthwise displacement are controlled. Method.

[0012]

With regard to the operation and control flow of each device in the above-mentioned configuration, the outline of the carrying line for carrying out the present invention in one mode is shown, and the electromagnets 3a and 3b shown in FIGS. 2 showing a cross section of FIG. 1 and the electromagnet 3
An explanation will be given based on FIG. 3 showing an outline of a current control device 10 for controlling the energization currents of a and 3b and the energization current of the metal strip 1 between the support rolls 2a / 2b.

In FIG. 1, reference numeral 1 is a magnetic material strip, 2a,
2b is a support roll which is also a belt-shaped object supporting device and a current-carrying device.
a and 3b are electromagnets having a structure in which the strip 1 is sandwiched,
As shown in FIG. 2, they are arranged so that the distances from the transport path lines are staggered. Here, the offset amount a in FIG. 2 is the allowable deviation amount of the strip 1 in the vertical direction <a / 2.
<The range of the electromagnet gap amount / 2 is set. Although it is at this installation position, it may be between the energizing support rolls 2a and 2b. Reference numeral 5 is a vertical displacement gauge for conveyance, and 4a and 4b are widthwise displacement gauges, and the installation position may be between the energization support rolls 2a and 2b and in the vicinity of the electromagnets 3a and 3b.

FIG. 1 shows a vertical transfer line, but a horizontal transfer line can be applied as long as it is a line for handling magnetic material strips, and the transfer line conditions are not limited.

A displacement meter for detecting the amount of deviation can be applied by an existing method such as a light emitting and receiving method in the width direction and a laser method in the vertical direction.

Next, regarding the operation, for example, when the magnetic material strip 1 which is being transported travels upward from the transport path line VL and rightward from the strip support device center line HL as shown in FIG. 2 and FIG.
Based on the following.

First, the displacement amount ΔC in the vertical direction is measured by the displacement meter 5 and sent to the compensation circuit 11 as a voltage signal. In the compensation circuit 11, compensation calculation based on the functions expressed by the equations (1) and (2) is serially performed, and the result is further sent to the arithmetic circuit 13 as a voltage signal.

[0018]

[Equation 1]

Next, in the arithmetic circuit 13, from the output signal e ₀ from the phase compensation circuit and the signal obtained by adding the displacement amount ΔC to the initial setting gap amount C, the electromagnet 3a is calculated by the equation (3).
Calculate the amount of electricity supplied to.

[0020]

[Equation 2]

The current value i determined by the calculation of the equation (3) is applied to the electromagnet 3a to generate an attractive force by the magnetic field to suppress the displacement of the belt-like material. At that time, the relationship between the generated magnetic flux density and the energization amount is expressed by the expression (5), and the relationship between the magnetic flux density and the attractive force is expressed by the expression (6). Further, the displacement response of the band-shaped object due to the generated suction force can be approximately expressed by the equation (7).

[0022]

[Equation 3]

Here, the vertical damping coefficient c is the viscous resistance of air and is assumed to be substantially zero. The spring constant k ₁ is a displacement resistance coefficient that acts by the transport tension of the strip. The above is the flow for suppressing the displacement of the strip in the vertical direction.

Next, in the conveyance width direction, first, similarly to the vertical direction, the deviation amount ΔL detected by the displacement gauges 4a and 4b is sent to the compensation circuit 12 as a voltage signal. Compensation calculation is performed in the compensation circuit 12 based on the function similar to the equation (2), and the result is further sent to the calculation circuit 14 as the voltage signal e ₃ .

In the arithmetic circuit 14, the electromagnetic force generated in the width direction is calculated based on the equation (8) from the voltage signal e _{3 of the} displacement amount in the width direction and the magnetic flux density calculated by the equation (5), and the electromagnetic force in the direction opposite to the displacement is calculated. A force is generated to suppress the displacement of the strip. Further, the displacement response of the strip 1 due to the generated electromagnetic force can be approximately expressed by the equation (9).

[0026]

[Equation 4]

Here, the horizontal damping coefficient c ₂ is the roll ₂ when the distance between the energizing support rolls 2a and 2b is short.
a, 2b and the band-shaped material 1, and when the distance between the energizing support rolls 2a, 2b is long, it is the viscous resistance of air and is considered to be almost zero. The spring constant k ₂ is a displacement resistance coefficient determined by the conveyance tension of the strip 1 and the rigidity in the horizontal direction. The above is the band-shaped material displacement suppression flow in the width direction.
The vertical and widthwise displacement of is suppressed simultaneously.

Here, in FIG. 2, a magnetic field is generated by the electromagnet 3b when it is displaced vertically downward (FIG. 2; right in FIG. 1), and when it is displaced leftward in the width direction (FIG. 2), it is strip-shaped. It suffices to reverse the energization direction to the object 1. That is, the energization direction to the strip 1 is a direction that corrects the deviation corresponding to the deviation direction.

Furthermore, in the case of continuously treating two or more kinds of continuous magnetic material strips, in the circle calculation circuit 13, (6)
Permeability μ _{1 in} the formula, m, c ₂ in the formulas (7) and (9),
By performing coefficient correction according to k ₁ , k ₂ and b in the equation (8) and generating the required electromagnetic force, the behavior control can be performed regardless of the material.

[0030]

EXAMPLES Examples of the present invention are shown below. Using the arrangement shown in FIG. 1, a SUS430 thin plate having a width of 370 mm and a thickness of 0.1 mm was run for control. The tension is 0.1 kg / mm ²
The running speed is 10 mpm, and the electromagnet has a gap of 300 m.
m, an iron core diameter of 120 mm, a coil winding number of 400 turns, and electromagnets 3a and 3b having an electric resistance of 2Ω were used, and the offset amount a of both electromagnets was set to 60 mm.

Rolls made of carbon material were used as the current-carrying devices (2a, 2b) for the thin plates, and the distance between the rolls was 5 m. The displacement gauges 4a and 4b in the width direction are of a light emitting and receiving type, and the displacement gauge 5 in the vertical direction is of a laser type.

For each coefficient used in the arithmetic circuit, the mass m of the strip 1 is 0.148 kg, and the spring constants k ₁ , k ₂ ,
And c ₂ are 2.7, 2.9 and 0.2, respectively, as a result of measurement in advance.
Met.

For each coefficient in the compensation circuits 11 and 12, equations (1) to (9) are expressed as a transfer function, and the responsiveness when a step-like disturbance fluctuation is given is numerically calculated in advance. The range was selected so that fluctuation could be suppressed. 5 and 6 show examples of control results when the strip 1 is actually conveyed by the above method.

FIG. 5 is a vertical displacement chart.
FIG. 6 is a displacement amount chart in the width direction. In both the vertical and width directions, the displacement could be suppressed almost at the same time as the control start.

[0035]

As described above, according to the present invention, a magnetic field is applied to a magnetic material-like conveyed product to control fluctuations in the conveying vertical direction, and in that state, the belt-like material is energized to generate a magnetic field. The electromagnetic force generated by the interaction can simultaneously control the fluctuation in the conveyance width direction.

Therefore, it is possible to stably convey the magnetic material strip, and the line is stopped due to the protrusion from the permissible conveyance area.
It has effects such as reduction of restoration loss, high-speed transportation, and the like, and is suitable as a transportation method and transportation line for magnetic material strips.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance of a belt-like material conveying line for carrying out the present invention in one aspect.

FIG. 2 is an enlarged sectional view showing a cross section of the electromagnets 3a and 3b and the strip 1 shown in FIG.

3 is a block diagram showing a configuration of a current control device 10 connected to the electromagnets 3a and 3b shown in FIG.

FIG. 4 is a longitudinal sectional view showing an outline of one conventional belt position control device.

FIG. 5 is a graph showing a vertical position change of the belt-shaped object when the vertical position setting value (target position) is changed stepwise while the belt-shaped object transfer control according to the present invention is performed.

FIG. 6 is a graph showing a change in the width direction position of the band when the width direction position set value (target position) is changed stepwise when the band transfer control according to the present invention is performed.

[Explanation of symbols]

1: Magnetic material band-shaped material 2a, 2b: Support roller for energizing a through-hole material 3a, 3b: Electromagnet 4: Width direction displacement meter 5a, 5b: Vertical direction displacement meter 6a, 6b: Nozzle 7: Jet air flow

Claims (3)

[Claims] 1. A method of transporting a metal strip having magnetism, the step of calculating a magnetic field strength according to a vertical displacement amount from a transport path line, a widthwise displacement amount from a center of a strip supporting device, and A conveyance method comprising a step of calculating an energization amount according to the magnetic field strength, wherein the conveyance vertical direction displacement and the conveyance width direction displacement are controlled. 2. In a device for transporting a magnetic metal strip, two electromagnets that impart magnetic field strength according to a vertical displacement amount from a transport path line are arranged such that the distances from the transport path line are staggered. An energizing device that is arranged and applies a current in accordance with the amount of displacement in the width direction from the center of the belt supporting device and the magnetic field strength. A transportation line characterized by having a meter. 3. A method of transporting two or more continuous magnetic material strips, wherein the magnetic field strength is calculated from the vertical displacement from the transport path line and coefficient correction corresponding to the magnetic permeability peculiar to the different materials. And a step of calculating a widthwise displacement amount from the center of the belt supporting device and an energization amount according to the magnetic field strength, wherein the conveyance vertical direction displacement and the conveyance widthwise displacement are controlled. .